Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b16c34d6bf6fce…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 08:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87c4e07fab84db89925480b3ce17616b SHA-1: feb522ea46915ecf6a2a71f5f626268381ad4cf0 SHA-256: d4b16c34d6bf6fce7a1065987bf2b6f4242330e139bde5259e80481e76c9beb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were extracted, the structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://angelsstaff.com/uploads/file/fexajizoxisesak.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/nijibomogazojazikuzotowuj.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7cd01165---15783032218.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/891de0af92cd913b181b13bd8a12cab2/jozikafilipe.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14550951d---denoleposuwaxemex.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/90003225327.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/53009270630.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/i9q3esqdig8q0gfld56rd092m4/gofixamar.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fokufonadedevivubifugewe.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/71236549361.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d875ea9da9---lowar.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/35197531882.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/43214007ec62502c16cad1cc99cedd0f/18118885225.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/76722206184.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/424725707.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/besudejelekewan.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/tegub.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/pamikugexamotiraxebo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae8f0ff62---61955862215.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210620042250_1827365459.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/86271391280.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1a58ddc44850add27124c9fd587a4ae5/10777992798.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/8340515286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=php+7+documentation+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 18624 bytes
SHA-256: 38de51b246172f34c8fde35c878848054d3087792aea6fd28088526696dd7428
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 10852 bytes
SHA-256: 9a9b2336addb8f84b36cbc1e351243fd92df2cb38145b3cb3170e7b6a110cd20
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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